This happened to me before. If you run it again, the Pinnacle drop might be on the ground. Try loading it back up and see what happens.
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I've since logged off and haven't logged back in yet, but usually going to tower brings all items to the postmaster, but I will definitely give that a go. Need to do a solo flawless anyways.
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Don't start from the beginning. Just load it back up from the checkpoint.
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But there wasn't a checkpoint, the game thinks I completed it. So when I click on the activity on the map, it is for a fresh session and doesn't have a checkpoint to start from.
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Hey were you ever able to get your lost linnacle? Because I just had the exact same problem and my reward never showed up in my postnaster.
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Nope, never got it. Good luck with yours, try restarting the game?